I'm not sure about that - if only because it gives a "large target" for insurers. Underwriting based on health conditions (something that is currently banned in

I'm not sure about that - if only because it gives a "large target" for insurers. Underwriting based on health conditions (something that is currently banned in the US for health insurance, but allowed for life/disability insurance) is all about the cost/benefit of searching for data. If a lot of people have data with Google, it might make sense to pay to look at it. Under US law at least, your health data isn't inaccessible to companies. It just requires your consent for release. That consent is basically baked into the process under a checkbox for the terms of whatever you're trying to buy. That said, this kind of data is probably uninteresting. Diagnoses & prescription drug fills are probably more indicative (and folks like https://www.rxhistories.com/ https://www.rxhistories.com/ helpfully aggregate and standardize the data).